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relay: explain/comment the code for extban handling

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This commit is contained in:
James Lu 2017-08-12 17:12:56 -07:00
parent e180f9fa56
commit d679859d7d
1 changed files with 16 additions and 6 deletions
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22
plugins/relay.py
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@ -835,7 +835,11 @@ def get_supported_cmodes(irc, remoteirc, channel, modes):
supported_char = remoteirc.cmodes.get(name)
# The mode we requested is an extban.
# The mode we requested is an extban on the target network.
# Basically there are 3 possibilities when handling extban-like modes:
# 1) Both target & source both use a chmode (e.g. ts6 +q). In these cases, the mode is just forwarded as-is.
# 2) Forwarding from chmode to extban - this is the case being handled here.
# 3) Forwarding from extban to extban (see below)
if name in remoteirc.extbans_acting:
# We make the assumption that acting extbans can only be used with +b...
old_arg = arg
@ -882,22 +886,28 @@ def get_supported_cmodes(irc, remoteirc, channel, modes):
irc.name, name, arg, remoteirc.name)
break
# Expand extbans known on the local IRCd to modes on the remote, if any exist.
# Extban case 3: forwarding extban -> extban or mode
# First, we expand extbans from the local IRCd into a named mode and argument pair. Then, we
# can figure out how to relay it.
for extban_name, extban_prefix in irc.extbans_acting.items():
log.debug('(%s) relay.get_supported_cmodes: checking for extban that needs expansion: '
'name=%s, extban_name=%s, arg=%s, extban_prefix=%s', irc.name, name, extban_name, arg,
extban_prefix)
# Acting extbans are only supported with +b (e.g. +b m:n!u@h)
if name == 'ban' and arg.startswith(extban_prefix):
orig_supported_char, old_arg = supported_char, arg
if extban_name in remoteirc.cmodes:
# This extban is a mode on the target network.
# This extban is a mode on the target network. Chop off the extban prefix and set
# the mode character to the target's mode for it.
supported_char = remoteirc.cmodes[extban_name]
arg = arg[len(extban_prefix):] # Strip off the extban prefix
arg = arg[len(extban_prefix):]
elif extban_name in remoteirc.extbans_acting:
# It is also an extban on the target network.
# This is also an extban on the target network. We broke up the extban already,
# so rewrite it into a new mode by joining the prefix and data together.
arg = remoteirc.extbans_acting[extban_name] + arg[len(extban_prefix):]
else:
# This mode/extban isn't supported, so ignore it.
log.debug('(%s) relay.get_supported_cmodes: blocking extban %s%s %s expansion as target %s doesn\'t support it',
irc.name, prefix, supported_char, arg, remoteirc.name)
mode_parse_aborted = True # XXX: nested loops are ugly...
@ -906,7 +916,7 @@ def get_supported_cmodes(irc, remoteirc, channel, modes):
log.debug('(%s) relay.get_supported_cmodes: expanding extban %s%s %s to %s%s %s for %s',
irc.name, prefix, orig_supported_char, old_arg, prefix,
supported_char, arg, remoteirc.name)
break
break # Only one extban per mode pair, so break.
if mode_parse_aborted:
break